Fooled with settings too much?

Hey experts, I was setting up a private server for a game, I know I have all of the settings I need to be right, however no one could connect to my server except for myself, no firewalls no antivirus, nothing to stop someone from getting in. I started to fool around with the settings in the modem to see if I could get it to work, now my internet light is out my internal and external ip's have changed. I had to go through the connection wizard to set up a new way to connect, it works but it is a real pain because now I have to manually start it up where it was always connected before. Hope I gave enough detail, thanks!